Slide Key Backlight Led Trouble Shooting - LG KE520 Service Manual

4.20 Slide Key Backlight LED Trouble Shooting

z Slide backlight LED Operation scheme is shown below.
z Slide Backlight operation
- Slide backlight LED is controlled with LED_ABC signal
- LED_ABC signal from ABB(U102)
- The LEDs are forward biased and turned on
z Check Point
- VBAT level ( 3.35 ~4.2V)
- LEDs
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VBAT
- 111 -
4. TROUBLE SHOOTING
LED_ABC
LGE Internal Use Only